CVE-2026-98564

In the Linux kernel, the following vulnerability has been resolved:

net: dsa: mt7530: leave the MDIO IRQ mappings to regmap-irq

mt7530_remove_common() disposes the per-PHY interrupt mappings from

.remove, but the regmap-irq chip that owns the domain is devm-registered,

so its parent interrupt is only freed once .remove has returned. The

switch's own regmap-irq thread can therefore still dispatch on a mapping

that is already gone: irq_find_mapping() returns 0, irq_to_desc() returns

NULL and handle_nested_irq() locks desc->lock without checking it. The

attached PHYs have not given those interrupts back yet either, which the

kernel warns about a moment before the fault.

regmap_del_irq_chip() disposes the same mappings itself, after freeing the

parent interrupt and before removing the domain, so there is nothing left

for the driver to do here. Until it runs the descriptors stay alive, and a

late dispatch on one of them is harmless: dsa_unregister_switch() has freed

the PHY handlers by then, so handle_nested_irq() finds no action and

returns.